CN113337774A - Process for inoculating nodular cast iron by silicon oxidation - Google Patents
Process for inoculating nodular cast iron by silicon oxidation Download PDFInfo
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- CN113337774A CN113337774A CN202010138797.7A CN202010138797A CN113337774A CN 113337774 A CN113337774 A CN 113337774A CN 202010138797 A CN202010138797 A CN 202010138797A CN 113337774 A CN113337774 A CN 113337774A
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- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 title claims abstract description 30
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 27
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 239000010703 silicon Substances 0.000 title claims abstract description 24
- 230000003647 oxidation Effects 0.000 title claims abstract description 16
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 102
- 229910052742 iron Inorganic materials 0.000 claims abstract description 51
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 23
- 238000011081 inoculation Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 229910052684 Cerium Inorganic materials 0.000 claims description 3
- 229910000805 Pig iron Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 235000012239 silicon dioxide Nutrition 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910002804 graphite Inorganic materials 0.000 description 7
- 239000010439 graphite Substances 0.000 description 7
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 239000002054 inoculum Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 1
- MIDOFQRPAXDZET-UHFFFAOYSA-N [Si].[Sr] Chemical compound [Si].[Sr] MIDOFQRPAXDZET-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- -1 silicon bismuth lanthanum Chemical compound 0.000 description 1
- UVGLBOPDEUYYCS-UHFFFAOYSA-N silicon zirconium Chemical compound [Si].[Zr] UVGLBOPDEUYYCS-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a process for inoculating nodular cast iron by silicon oxidation, which comprises the following specific steps: firstly, sequentially adding a layer of nodulizer and a layer of covering agent into a pit of a ladle from bottom to top; firstly, adding a ferrosilicon block into the part of the ladle above the covering agent; and injecting molten iron, injecting the molten iron along with the molten iron, and adding the ferrosilicon block again. The process adopted by the invention is simple to operate and easy to implement, can obviously improve the inoculation effect of the ductile iron and greatly improve the quality of the ductile cast iron.
Description
Technical Field
The invention belongs to the technical field of nodular cast iron production, and particularly relates to a process for inoculating nodular cast iron by silicon oxidation.
Background
In the prior process for producing the nodular cast iron, in order to obtain spherical graphite with round shape, an expensive inoculation material is mostly adopted; alloying a plurality of precious metals with silicon; such as silicon strontium, silicon zirconium, silicon bismuth lanthanum inoculants, etc. are added to the molten iron containing magnesium to obtain spherical graphite with rounded morphology. In the prior art, although an oxide (silicate SiO2) generated by oxidizing silicon on the surface of molten iron is used as a transition layer for growing graphite nodules in nodular cast iron, the silicate SiO2 has good matching degree with graphite, and spherical graphite with round shape can be more easily obtained in the process of producing the nodular cast iron. However, in the existing process, the silicon block is arranged above the nodulizer, and the steel plate is arranged on the silicon block, so that the generation of silicate is influenced, and the nodulizing rate cannot meet the secondary requirement all the time. At present, most of the adopted solutions are to add other mixtures to generate silicate, so that the process is complex and the cost is high.
Disclosure of Invention
In view of the above, the invention provides a process for inoculating nodular cast iron by silicon oxidation, aiming at overcoming the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a process for inoculating nodular cast iron by silicon oxidation comprises the following steps:
sequentially adding a layer of nodulizer and a layer of covering agent into a pit of the ladle from bottom to top;
firstly, adding a ferrosilicon block into the part of the ladle above the covering agent;
and injecting molten iron, injecting the molten iron along with the molten iron, and adding the ferrosilicon block again.
Further, the molten iron comprises the following components in percentage by mass: 3.2 to 3.8 percent of C, 1.9 to 2.7 percent of Si, 0.1 to 0.6 percent of Mn, less than or equal to 0.04 percent of P, 0.02 to 0.008 percent of S, 0.035 to 0.045 percent of Mg, 0.02 to 0.03 percent of Ce, 0.4 to 0.6 percent of Cu, 0.05 to 0.08 percent of Sn, 0.3 to 0.5 percent of Mo, and the balance of pig iron.
Further, the covering agent is made of a steel sheet.
Further, the grain size of the silicon iron block is 30-40mm3。
Further, the temperature of the molten iron is controlled to be 1460-1500 ℃.
Further, the nodulizer has a granularity of 5-20mm3MgSiCeFe alloy of (1).
Further, when molten iron is filled, the first 70 percent of the molten iron is quickly filled, the filling speed is slowed down for the second 30 percent of the molten iron, and the ferrosilicon block is added again in the process of filling the molten iron at a low speed.
Compared with the prior art, the invention has the following advantages:
the process of the present invention is to utilize silicate (SiO2) produced by oxidizing silicon on the surface of molten iron containing magnesium to blend into molten iron, and this can raise inoculation effect of nodular cast iron obviously and raise the quality of nodular cast iron greatly.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
FIG. 1 is a schematic diagram of the inventive process in practice.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
A process for inoculating nodular cast iron by silicon oxidation comprises the following steps:
a nodulizer 1 and a covering agent layer 2 are sequentially arranged in a pit of the ladle 4 from bottom to top;
firstly, adding a ferrosilicon block 3 into the part of the ladle above a covering agent, wherein the covering agent is a steel sheet generally, and the thickness of the steel sheet is 1-5mm generally. The nodulizer generally adopts a particle size of 5-20mm3MgSiCeFe alloy of (1).
And injecting molten iron, injecting the molten iron along with the molten iron, and adding the ferrosilicon block again. The grain size of the silicon iron block is 30-40mm3. Generally, the temperature of molten iron is controlled between 1460 ℃ and 1500 ℃. Fig. 1 is a schematic view of a ladle according to the present invention.
Specifically, when molten iron is filled, 70% of molten iron is quickly filled, then the filling speed of 30% of molten iron is slowed down, and in the process of filling the molten iron at a low speed, the ferrosilicon block is added again to form floating silicon, and the floating silicon can react with oxygen at a high temperature to generate SiO2, so that the growth of spheroidal graphite is facilitated.
Generally, the ferrosilicon blocks added before the molten iron is poured and the ferrosilicon blocks added during the slow molten iron pouring account for half of the total ferrosilicon block filling amount, that is, half of the ferrosilicon blocks are added before the molten iron is poured, and the ferrosilicon blocks can fully react with the molten iron at the bottom of the ladle during the molten iron spheroidization reaction, gradually float upwards and fully react with the molten iron. The later added ferrosilicon blocks can also float upwards after entering molten iron. During the reaction, it was visually observed that the ferrosilicon ingot was tumbled in the molten iron to appear magnesium light.
The ferrosilicon block suspended in the molten iron reacts with oxygen in the air under the high-temperature condition of the molten iron to generate a transition layer SiO2 required by the growth of the ductile iron graphite. Then molten iron in the spheroidizing process is turned over, and molten but unoxidized silicon (Si) and silicon dioxide (SiO2) generated by oxidation are uniformly involved into the molten iron.
The ferrosilicon block selected in the invention is preferably 75 ferrosilicon, and the specific gravity of the 75 ferrosilicon is 3.6, and the specific gravity of the molten iron is more than 6. After the molten iron enters the ladle, the 75-Si iron block floats on the surface of the molten iron.
In the prior art, for producing the ductile iron with the grade of more than 2, under the conventional process conditions, imported sulfur-oxygen inoculant needs to be adopted, the price is about 40000 yuan/ton, and the price of the imported high-bismuth inoculant is about 30000 yuan/ton (the adding amount is 0.15%).
In the prior art, for producing the ductile iron of grade 3 to grade 4, the price of the adopted inoculant is generally more than or equal to 12000 yuan/ton (the addition amount is 0.2%) under the conventional process conditions.
The process can effectively save cost, and the cost of the inoculation material is as follows:
the silicon oxidation inoculation process technology provided by the invention is adopted to produce the ductile iron with the grade of more than 2, only domestic ferrosilicon is adopted, and the price is less than or equal to 7000 yuan/ton. In actual industrial production, the production cost can be greatly reduced, and the profit margin is improved. Meanwhile, after silicate (SiO2) generated by oxidizing silicon on the surface of molten iron containing magnesium is melted into the molten iron, the inoculation effect of the ductile iron can be obviously improved, and the quality of the ductile cast iron is greatly improved.
In a specific embodiment, the molten iron comprises (by mass): 3.2 to 3.8 percent of C, 1.9 to 2.7 percent of Si, 0.1 to 0.6 percent of Mn, less than or equal to 0.04 percent of P, 0.02 to 0.008 percent of S, 0.035 to 0.045 percent of Mg, 0.02 to 0.03 percent of Ce, 0.4 to 0.6 percent of Cu, 0.05 to 0.08 percent of Sn, 0.3 to 0.5 percent of Mo, and the balance of pig iron.
The process adopted by the invention is simple to operate and easy to implement, can obviously improve the inoculation effect of the ductile iron and greatly improve the quality of the ductile cast iron.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (7)
1. The process for inoculating nodular cast iron by silicon oxidation is characterized by comprising the following steps:
sequentially adding a layer of nodulizer and a layer of covering agent into a pit of the ladle from bottom to top;
firstly, adding a ferrosilicon block into the part of the ladle above the covering agent;
and injecting molten iron, and adding the ferrosilicon block again along with the injection of the molten iron.
2. The process of silicon oxidation inoculation of nodular cast iron as claimed in claim 1, wherein: the molten iron comprises the following components in percentage by mass: 3.2 to 3.8 percent of C, 1.9 to 2.7 percent of Si, 0.1 to 0.6 percent of Mn, less than or equal to 0.04 percent of P, 0.02 to 0.008 percent of S, 0.035 to 0.045 percent of Mg, 0.02 to 0.03 percent of Ce, 0.4 to 0.6 percent of Cu, 0.05 to 0.08 percent of Sn, 0.3 to 0.5 percent of Mo, and the balance of pig iron.
3. The process of silicon oxidation inoculation of nodular cast iron as claimed in claim 1, wherein: the covering agent is a steel sheet.
4. The process of silicon oxidation inoculation of nodular cast iron as claimed in claim 1, wherein: the grain size of the silicon iron block is 30-40mm3。
5. The process of silicon oxidation inoculation of nodular cast iron as claimed in claim 1, wherein: the temperature of the molten iron is controlled between 1460 ℃ and 1500 ℃.
6. The process of silicon oxidation inoculation of nodular cast iron as claimed in claim 1, wherein: the nodulizer has a particle size of 5-20mm3MgSiCeFe alloy of (1).
7. The process of silicon oxidation inoculation of nodular cast iron as claimed in claim 1, wherein: when molten iron is filled, the first 70 percent of the molten iron is quickly filled, the second 30 percent of the molten iron is slowly filled, and the second time of adding the ferrosilicon blocks is carried out in the process of filling the molten iron slowly.
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| CN202010138797.7A CN113337774B (en) | 2020-03-03 | 2020-03-03 | Silicon oxide inoculation nodular cast iron technology |
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| CN202010138797.7A CN113337774B (en) | 2020-03-03 | 2020-03-03 | Silicon oxide inoculation nodular cast iron technology |
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Effective date of registration: 20240220 Address after: 054500 the west side of Nam Dinh Wei Road, Pingxiang County, Xingtai, Hebei. Patentee after: HEBEI OUNAI MECHANICAL MOULD Co.,Ltd. Country or region after: China Address before: 300450 No. 902, gate 8, Shengtai apartment, Third Street, Tanggu District, Binhai New Area, Tianjin Patentee before: Chen Shuping Country or region before: China |
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